• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to the servo-control of the wavelength of a laser (2) on an atomic transition. It proposes in particular a method comprising the steps of: - emitting a laser beam towards a cell (3) filled with an atomic vapor; - providing energy to the atoms of the atomic vapor using a power source (4); generating a DAVLL signal (SDAVLL) from the laser beam having passed through the cell (3); and - slaving the wavelength of the laser using the signal DAVLL. According to the invention, the energy input to the atoms of the atomic vapor is modulated to achieve the alternation of a first energy supply phase and a second energy supply phase, the energy input of the second phase being of lower intensity than the supply of energy of the first phase.
    公开号:FR3070817A1
    申请号:FR1758217
    申请日:2017-09-06
    公开日:2019-03-08
    发明作者:Francois BEATO；Agustin PALACIOS LALOY
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    OPTICAL MEASUREMENT SYSTEM WITH STABILIZED DAVLL SERVO DESCRIPTION
    TECHNICAL AREA
    The field of the invention is that of the control of the wavelength of the light emitted by a laser on an atomic transition. The invention relates more particularly to a so-called DAVLL servo (for Dichroic Atomic Vapor Laser Lock) which performs a separation by Zeeman shift of polarization components of a laser beam and generates an error signal which corresponds to the difference in the rates of absorption of these polarization components in an atomic vapor.
    PRIOR STATE OF THE ART
    Atomic sensors use a set of atoms in weak interaction with each other as a sensitive element to measure and / or follow different physical quantities (time, magnetic field, acceleration for example) with high sensitivity and / or high accuracy.
    These sensors are divided into two large families. One thus counts on the one hand the sensors exploiting an atomic gas heated or thermalized with the environment (which implies significant diffusion rates, typically of the order of 10 to 1000 m / s), often called sensors with hot atoms or optically pumped sensors. On the other hand, there are the sensors which use laser trapping and cooling techniques to overcome the thermal and displacement effects of the atoms. The atoms are thus confined in a measurement volume where the state of each atom can be monitored and measured individually. These sensors are said to have cold atoms.
    It will also be noted that certain systems, such as the azotelacune centers of diamonds, which even if they are in solid state have an energy spectrum close to the atoms of an atomic gas and exhibit similar behaviors. These systems are thus often included in the field of atomic sensors.
    S63211 FR-TM
    The accuracy of these atomic sensors is based on the invariability of the properties of atoms: all the atoms of a chemical species are effectively perfectly equivalent to each other, and have properties that are calculable and invariant over time. This makes it possible in particular to overcome the drifts which appear on other sensors, such as mechanical or electrical sensors produced in semiconductors which are subject to aging which inevitably causes their behavior to vary over time.
    Thus, among the atomic sensors, there are clocks reaching excellent levels of accuracy (atomic clocks), but also magnetometers, gyroscopes, accelerometers and atomic gravimeters which allow very precise measurements of the magnetic field, rotation, acceleration and the gravitational field. In other sensors targeting sensitivity rather than accuracy, the benefit obtained comes from the weak interaction between the different atoms: this is particularly the case for low-noise magnetometers based on uncooled atoms.
    Most of these sensors use laser type light sources. These light sources are characterized in particular by a great spectral fineness, the light being emitted only in a very narrow range of wavelength around a central value (the standard deviation being of the order of a few tens of MHz, but can reach Hz on certain lasers). This spectral finesse is important to allow tuning in a controlled manner to the different atomic transitions necessary to prepare the atoms for measurement or to obtain information on the state of the atoms. For the same purpose, it is important that the light is very precisely tuned to the desired wavelength without there being a systematic shift or drift between the position of the laser line and the atomic transition (s) used.
    We therefore generally seek to control the laser control parameters so that they are stable at a fixed wavelength with respect to a given atomic transition. The objective is that the difference between the central wavelength of the light emitted by the laser and that of the target atomic transition is less than values which could induce undesirable effects, such as
    S63211 FR-TM loss of signal, absence of laser cooling, light shifts (effect known as "light-shift" or "AC-Stark shift" consisting of a circularly polarized light not tuned to an atomic transition behaves like a fictitious magnetic field disturbing the behavior of atoms) or other related effects introducing significant faults in the functioning of an atomic sensor.
    Different techniques for slaving a laser to an atomic transition have been proposed. A technique is known in particular which consists in modulating the wavelength of the laser around the target atomic transition and in performing the servo-control of its odd symmetry to zero (technique known in the literature as "dither lock"). However, this technique has the drawback of being insensitive to wavelength differences and of requiring modulation of the laser. However, this modulation is penalizing. Indeed, even if the central wavelength of the laser is well fixed on the atomic transition, the modulation induces a spectral spread over a range of the order of the bonding range of the servo. This attachment range is also at most of the order of the width of the atomic line used as a reference, and cannot be much less than this.
    An improvement making it possible to increase the sensitivity of the servo-control is based on saturated absorption techniques (also known as "Doppler-free spectroscopy") which allow access to the atomic line by overcoming the enlargements coming from the thermal velocity of atoms.
    We also know, for example documents [1] and [2] cited at the end of the description, a control technique which avoids any modulation of the laser. This principle of enslavement is based on the dichroism of an atomic vapor subjected to a strong magnetic field (of the order of 1-1000 mT). This technique is known in the literature as DAVLL ("Dichroïc Atomic Vapor Laser Lock").
    This DAVLL technique uses a magnet to separate the lines corresponding to the circular polarizations o + and o- from a shift greater than the width of the optical line of the atomic transition targeted (this width being fixed either by Doppler enlargement or by its enlargement pressure). The atomic gas thus acquires a circular dichroism which cancels out very precisely for the wavelength
    S63211 FR-TM corresponding to the atomic transition. This dichroism is measured by an optical arrangement of polarimetry consisting of a quarter wave plate which converts the circular polarizations σ + and σ- into linear polarizations, a beam splitter which separates the linear polarizations and two photodiodes which each receive l 'one of the linear polarizations. The currents of these photodiodes are proportional to the intensities of the left and right circular polarizations at the output of the atomic gas cell. These currents are transformed into voltages by transimpedance amplifiers. The difference of these voltages forms a DAVLL signal. Slaving the DAVLL signal to zero allows the laser to be calibrated on the center of the atomic transition, in particular by supplying a voltage setpoint to a piezoelectric transducer which controls the orientation of a laser output mirror for a laser cavity, or by supplying a current setpoint to a Peltier module which controls the temperature of the diode in the case of a semiconductor laser.
    It has been observed that the thermal stability of the optical assemblies of polarimetry necessary to generate a DAVLL signal is critical for the stability of the servo. The document [3] cited at the end of the description illustrates in this respect the difficulties which can arise when the polarimetry arrangement is sensitive to temperature.
    The use of optical elements of high thermal stability partly solves the problem, but makes mounting polarimetry expensive and excludes the use of elements based on polarizing polymer films. Document [3] proposes optical assembly settings dependent on the servo point, which makes it possible to be sensitive only to second order temperature variations. But the latter solution requires complex adjustments and does not entirely solve the problem.
    STATEMENT OF THE INVENTION
    The invention aims to improve the stability, in particular thermal, of a DAVLL control by means of a technique which is simple to implement and inexpensive.
    S63211 FR-TM
    To this end, it proposes a method for controlling the wavelength of a laser on an atomic transition, comprising the steps consisting in:
    - emit a laser beam towards a cell filled with atomic vapor;
    - make an energy supply to the atoms of the atomic vapor using an energy source;
    - generate a DAVLL signal from the laser beam having passed through the cell; and
    - control the wavelength of the laser using the DAVLL signal.
    The supply of energy to the atoms of atomic vapor is modulated to alternate between a first phase of supply of energy and a second phase of supply of energy, the supply of the second phase being of lower intensity than the energy supply of the first phase.
    Some preferred but non-limiting aspects of this process are as follows:
    the energy supply of the first phase has an intensity such that the atoms are brought into an energized state where they are capable of undergoing said atomic transition when they are illuminated by the laser beam;
    the energy supply of the second phase has zero intensity;
    the step consisting in generating a DAVLL signal from the laser beam having passed through the cell comprises the operations consisting in:
    o polarize the laser beam to create a combination of two polarizations of a first type;
    o separate the two polarizations of the first type by means of a source of dichroism;
    o convert the two polarizations of the first type at the cell output into two polarizations of a second type;
    o separate the two polarizations of the second type into two beams;
    o photodetect the two separate beams, convert the photodetected beams into corresponding voltages and measure the difference of said voltages;
    S63211 FR-TM the measurement of the difference of said voltages includes the calculation of the following normalized imbalance:
    Vl, Phl ~ Vl, Ph2 _ ^ 2, Phi ~ ^ 2, Ph2
    Vj, Ph2 ______________ ^ 2, Ph2
    Vl, Phl ~ Vj, Ph2 ^ 2, Phl - ^ 2, Ph2
    Vl, Ph2 ^ 2, Ph2
    OR :
    Viphi represents the voltage measured by a first photodetector during the first phase of the energy supply;
    Li, p / i2 represents the voltage measured by the first photodetector during the second phase of the energy supply;
    ^ 2, ρλι represents the voltage measured by a second photodetector during the first phase of the energy supply; and ^ 2, ρλ2 represents the voltage measured by the second photodetector during the second phase of the energy supply;
    the source of dichroism is a source of magnetic field;
    the magnetic field source comprises one or more magnets arranged around the cell;
    the magnetic field source comprises a coil arranged around the cell, said coil being traversed by a constant current;
    the magnetic field source is a fictitious magnetic field induced by an alternating Stark shift;
    the energy supply to the atoms of atomic vapor is modulated to include a third phase in sequence with the first and second phases, the intensity of the energy supply of the third phase being identical to the intensity of the energy supply of the first phase and the magnetic field source being interrupted during the third phase;
    the energy source is a HF discharge source or a thermal energy source.
    The invention also relates to an optical measurement system, comprising:
    S63211 FR-TM
    - a cell filled with atomic vapor and arranged to receive a laser beam emitted by a laser;
    an energy source for providing energy to the atoms of the atomic vapor, the energy source being configured to alternate between a first energy supply phase and a second phase d energy supply, the energy supply of the second phase being of lower intensity than the energy supply of the first phase;
    - an optical arrangement of polarimetry configured to generate a DAVLL signal from the laser beam having passed through the cell; and
    - a circuit for controlling the wavelength of the laser on an atomic transition using the DAVLL signal.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Other aspects, aims, advantages and characteristics of the invention will appear better on reading the following detailed description of preferred embodiments thereof, given by way of nonlimiting example, and made with reference to the figure. 1 appended which represents a diagram of an optical measurement system according to a possible embodiment of the invention.
    DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS
    The invention relates to a DAVLL method and system for controlling the wavelength (center) of a laser on an atomic transition. With reference to FIG. 1, the laser 2 equips an optical measurement system which comprises a cell 3 filled with atomic vapor, said cell 3 being arranged to receive a laser beam emitted by the laser, and an energy source 4 to provide energy to the atoms of the atomic vapor.
    The laser 2 can comprise an output mirror 5 mounted on a piezoelectric transducer 6 able to control the position and / or the orientation as a function of a voltage setpoint supplied to said transducer 6. The laser 2 can alternatively
    S63211 FR-TM include a Peltier module able to control the temperature of a diode according to a current setpoint.
    The energy source 4 is responsible for bringing the atoms of the atomic vapor into an energized state where they are capable of undergoing said atomic transition when they are illuminated by the laser beam. In other words, in the energized state, the atoms of atomic vapor affect the properties of laser light passing through cell 3 sufficiently intensely that the changes in these properties are measurable.
    The energy source 4 can be a source of HF discharge (in the case of helium for example) or a source of thermal energy (in the case of alkali metals for example, to ensure sufficient density in the gas phase) . Taking the example of a cell filled with helium, the target atomic transition corresponds for example to the line D o (i.e. a central wavelength at 1083.205 nm) and the energy source 4 is responsible for bringing the helium atoms into the metastable state 2 3 Si. The energy source is typically a source of HF discharge which brings the helium atoms into the metastable state by creation of a plasma and radiative cascade.
    The laser servo system 1 comprises an optical assembly of polarimetry 7-13 configured to generate a DAVLL S D avll signal from the laser beam having passed through the cell and a servo circuit 14 of the laser wavelength using the signal DAVLL Sdavll In a known manner, the optical polarimetry assembly comprises upstream of the cell 3 a polarizer 7 which receives the laser beam and creates a polarization which is a combination of two polarizations of a first sensitive type to the dichroism of atoms. The polarizer 7 is thus a linear polarizer coming to create a combination of two circular polarizations when the atoms exhibit a circular dichroism (this is the case of helium in particular). Polarizer 7 is a circular polarizer which creates a combination of two linear polarizations when the atoms exhibit linear dichroism.
    The optical polarimetry assembly also includes a source of dichroism 8 surrounding the cell 3 to separate the two polarizations of the first
    S63211 FR-TM type. The source of dichroism 8 is for example a source of magnetic field. The magnetic field source may include one or more magnets arranged around the cell.
    In a first alternative, the magnetic field source can comprise a coil arranged around the cell, said coil being traversed by a constant current.
    In a second alternative, the magnetic field source is a fictitious magnetic field source induced by light shifts in the laser beam not tuned to the target atomic transition (effect known as “light-shift” or alternative Stark shift for "AC-Stark shift"). For this purpose, another laser beam can be used which propagates perpendicular to the laser beam used to obtain the DAVLL signal. This other laser beam is voluntarily offset in frequency with respect to the transition of interest (D o for example) which induces in the system a fictitious magnetic field, and induces the same dichroism properties as previously.
    The optical polarimetry assembly further comprises, downstream of the cell 3, a polarization converter 9, typically a quarter wave plate, for converting the two polarizations of the first type at the output of the cell into two polarizations of a second type, and a beam splitter 10 for separating the two polarizations of the second type into two beams. Taking the example of a polarizer 7 of the linear type, the polarization converter 9 converts the two circular polarizations into two linear polarizations, and the separator 10 comes to separate the two linear polarizations into two beams. Each of these beams is directed towards a photodetector 11,
    12. Each photodetector 11, 12 converts the photodetected beam into a corresponding voltage. The voltages delivered by the photodetectors 11, 12 are subtracted from one another by a computer 13, thus providing the signal DAVLL which serves as an error signal for the wavelength control of the laser. In one possible embodiment, the computer performs the calculation of a normalized imbalance by calculating the ratio of the difference of the voltages delivered by the photodetectors 11, 12 by the sum of said voltages.
    S63211 FR-TM
    Thus, the step consisting in generating a DAVLL signal from the laser beam having passed through the cell comprises the operations consisting in:
    - Polarize, using the polarizer 7, the laser beam to create a combination of two polarizations of a first type;
    - separate the two polarizations of the first type by means of the source of dichroism 8;
    converting, by means of the converter 9, the two polarizations of the first type at the output of the cell into two polarizations of a second type;
    - Separate, by means of the separator 10, the two polarizations of the second type into two beams;
    - photodetect the two separate beams and convert the photodetected beams into corresponding voltages, by means of photodetectors 11, 12; and
    - measure the difference of said voltages by means of computer 13.
    The separator 10 can be a separator cube formed by two straight non-birefringent prisms and a polarizing polymer film disposed between the two bonded faces of the prisms. Thus the polarization separation is ensured by the polymer film which reflects one of the polarizations and transmits the other. Such prisms are much less expensive than prisms made of birefringent materials.
    The quarter-wave plate can be chosen from polymer or quartz, the quartz version having better thermal stability.
    In the context of the invention, the energy source 4 responsible for energizing the atoms of cell 3 is configured to alternate between a first phase of energy supply and a second phase d energy supply. More particularly, the energy supply of the second phase is of lower intensity than the energy supply of the first phase.
    The energy supply of the first phase has an intensity such that the atoms are brought into the energized state (the metastable state 2 3 Si in the case of helium) where they are capable of undergoing said atomic transition when 'they are lit by the laser beam.
    S63211 FR-TM
    This modulation of the intensity of the energy source 4 thus alternates a first phase where there is a high density of atoms in a state where they are liable to undergo said atomic transition, and a second phase where we have a lower density, even zero, of these atoms.
    The high density of atoms obtained by the implementation of the first phase allows the laser light passing through the cell to be affected by the atoms in sufficient intensity for the changes to be measurable.
    On the other hand, the low, or even zero, intensity of the second phase makes it possible to measure the optical response of the atomic sensor. Knowledge of this optical response then makes it possible to overcome slow optical variations with respect to the speed of the modulation of the energy source 4, such as for example variations linked to variations in temperature.
    The frequency of the alternation between the first and the second energy supply phase is preferably at most 1 kHz. It will be noted that the wavelength control of the semiconductor lasers is usually carried out on the Peltier module which controls their temperature (in fact the other laser control parameter, the current, induced, besides variations in length d wave, large variations in optical power which are not desirable). However, the bandwidth of such a Peltier module is typically less than Hz so that the modulation of the energy supply according to the invention does not introduce any loss of information.
    The energy input of the second phase can have zero intensity. Alternatively, the energy supply of the second phase can have a non-zero intensity. This alternative can be advantageous when the modulation of the energy supply is carried out at a frequency such that the atoms energized during the first phase do not have time to return to their ground state before being energized again. In such a scenario, a modulation is then carried out which modifies the intensity of the energy supply, between an intense supply during the first phase and a less intense supply during the second phase.
    In the context of the invention, the computer 13 is configured to calculate a DAVLL signal corresponding to the difference of the voltages delivered by the
    S63211 FR-TM photodetectors free of slow optical variations. To eliminate these slow optical variations, for each of the photodetectors 11, 12, the voltage measured by the photodetector during the second energy supply phase is subtracted from the voltage measured by the photodetector during the second energy supply phase. 'energy.
    The DAVLL signal can thus be written (7 1 / Pftl - 7 1 / Pft2 ) - (ν 2 ΡΛ1 - V 2 Pfl2 ), where:
    - Vi, phi represents the voltage measured by the first photodetector 11 during the first phase of the energy supply;
    - Ιι, ρλ2 represents the voltage measured by the first photodetector 11 during the second phase of the energy supply;
    - ^ 2, ρλι represents the voltage measured by a second photodetector 12 during the first phase of the energy supply; and
    - ^ 2, ρκ2 represents the voltage measured by the second photodetector 12 during the second phase of the energy supply.
    This signal can also be normalized according to: V1 ' phl —_
    Vl, Ph2 V2 ' phl - V2 ' ph2 _ And in one possible embodiment, the computer 13 comes to determine V2, Ph2 for signal DAVLL the following normalized imbalance:
    Vl, Phl ~ ^ L, P / t2 _ ^ 2, Pftl ~ V2, Ph2
    Vl, V2 ______________ Ph2, Ph2
    Vl, Phl ~ ^ L, P / t2 ^ 2, Pftl ~ ^ 2, Pft2
    Vl, Ph2 V 2 , Ph 2
    The calculation of this normalized imbalance has the advantage of making it possible to overcome variations in intensity of the energy supply over several cycles of the modulation, as well as variations in intensity of the laser.
    The DAVLL signal S D avll determined by the computer 13 is supplied to a circuit 14 for controlling the wavelength of the laser which, depending on the DAVLL error signal, can supply a voltage setpoint for the piezoelectric transducer 6 driving the laser output mirror 5 or a current setpoint for the Peltier module.
    When the source of dichroism 8 takes the form of a source of controllable magnetic field, as is the case of the two alternatives mentioned
    S63211 FR-TM previously (coil traversed by a current and laser beam inducing a fictitious magnetic field), the energy supply to the atoms of the atomic vapor can be modulated to include a third phase of energy supply carried out in sequence of the first and second phases previously discussed. The first and second phases operate with a magnetic field, generated by the source of dichroism, constant. During the third phase, this constant magnetic field is interrupted while an energy supply to the atoms of the atomic vapor is carried out, for example such as during the first phase, in order to have a high density of atoms in a state where they are likely to undergo the atomic transition. This third phase brings us back to a classic magnetometer architecture. In addition, during this third phase, the magnetic field source to be used in order to create a radiofrequency magnetic field, making it possible to carry out a measurement of the magnetometry type. We then combine in a single system the wavelength of the laser and an operational measurement of magnetometry.
    REFERENCES [1] B. Chéron, H. Gilles, J. Hamel, O. Moreau, H. Sorel. Laser frequency stabilization using Zeeman effect. Journal de Physique III, EDP Sciences, 1994, 4 (2), pp.401-406.
    [2] US 6,099,111 [3] J. M. Reeves, O. Garcia, C. A. Sackett. Temperature stability of a dichroic atomic vapor laser lock. Appl. Opt., AO, vol. 45, no. 2, pp. 372-376, 2006
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Method for controlling the wavelength of a laser (2) on an atomic transition, comprising the steps consisting in:
    - emit a laser beam towards a cell (3) filled with atomic vapor;
    - providing energy to the atoms of the atomic vapor using an energy source (4);
    - generate a DAVLL signal (S D avll) from the laser beam having passed through the cell (3); and
    - control the wavelength of the laser using the DAVLL signal;
    characterized in that the energy supply to the atoms of the atomic vapor is modulated to achieve the alternation of a first phase of energy supply and a second phase of energy supply, the supply energy of the second phase being of lower intensity than the energy supply of the first phase.
    [2" id="c-fr-0002]
    2. Method according to claim 1, in which the energy supply of the first phase has an intensity such that the atoms are brought into an energized state where they are capable of undergoing said atomic transition when they are illuminated by the beam. laser.
    [3" id="c-fr-0003]
    3. Method according to one of claims 1 and 2, wherein the energy supply of the second phase has zero intensity.
    [4" id="c-fr-0004]
    4. Method according to one of claims 1 to 3, in which the step consisting in generating a DAVLL signal from the laser beam having passed through the cell comprises the operations consisting in:
    - polarize the laser beam to create a combination of two polarizations of a first type;
    S63211 FR-TM
    - separate the two polarizations of the first type by means of a source of dichroism (8);
    - convert the two polarizations of the first type at the cell outlet into two polarizations of a second type;
    - separate the two polarizations of the second type into two beams;
    - photodetect the two separate beams, convert the photodetected beams into corresponding voltages and measure the difference of said voltages.
    [5" id="c-fr-0005]
    5. Method according to claim 4, in which the measurement of the difference of said voltages comprises the calculation of the following normalized imbalance:
    Vl, Phi - Vi, p / i2 _ ^ 2, Phl ~ ^ 2, Ph2
    Vj, Ph2 ______________ ^ 2, Ph2
    Vl, Phl ~ Vl, Ph2 ^ 2, Phi ~ ^ 2, Ph2
    Vl, Ph2 ^ 2, Ph2
    OR :
    Vi Phl represents the voltage measured by a first photodetector (11) during the first phase of the energy supply;
    ^ ι, ρ / ι2 represents the voltage measured by the first photodetector (11) during the second phase of the energy supply;
    ^ 2, p / ii represents the voltage measured by a second photodetector (12) during the first phase of the energy supply; and ^ 2, p / i2 represents the voltage measured by the second photodetector (12) during the second phase of the energy supply.
    [6" id="c-fr-0006]
    6. Method according to one of claims 4 and 5, wherein the source of dichroism (8) is a source of magnetic field.
    [7" id="c-fr-0007]
    7. The method of claim 6, wherein the magnetic field source comprises one or more magnets arranged around the cell.
    S63211 FR-TM
    [8" id="c-fr-0008]
    8. The method of claim 6, wherein the magnetic field source comprises a coil arranged around the cell, said coil being traversed by a constant current.
    [9" id="c-fr-0009]
    9. The method of claim 6, wherein the magnetic field source is a fictitious magnetic field induced by an alternating Stark offset.
    [10" id="c-fr-0010]
    10. Method according to one of claims 8 and 9, wherein the energy supply to the atoms of the atomic vapor is modulated to include a third phase of energy supply in sequence of the first and second phases, intensity of the energy supply of the third phase being identical to the intensity of the energy supply of the first phase and the source of magnetic field being interrupted during the third phase.
    [11" id="c-fr-0011]
    11. Method according to one of claims 1 to 10, wherein the cell (3) contains helium, the atomic transition corresponds to the line D o and the energy supply of the first phase has an intensity such that the helium atoms are brought into the metastable state 2 3 Si.
    [12" id="c-fr-0012]
    12. Method according to one of claims 1 to 11, wherein the energy source (4) is a source of HF discharge.
    [13" id="c-fr-0013]
    13. Method according to one of claims 1 to 10, wherein the energy source (4) is a source of thermal energy.
    [14" id="c-fr-0014]
    14. Method according to one of claims 1 to 13, wherein the frequency of the alternation between the first and the second energy supply phase is at most 1 kHz.
    S63211 FR-TM
    [15" id="c-fr-0015]
    15. Optical measurement system, comprising:
    - a cell (3) filled with atomic vapor and arranged to receive a laser beam emitted by a laser;
    - an energy source (4) to provide energy to the atoms of the
    5 atomic vapor;
    - an optical polarimetry assembly (7-13) configured to generate a DAVLL signal (Sdavll) from the laser beam having passed through the cell; and
    - a control circuit (14) of the wavelength of the laser on an atomic transition using the signal DAVLL;
    10 characterized in that the energy source (4) is configured to alternate between a first energy supply phase and a second energy supply phase, the energy supply of the second phase being of lower intensity than the energy supply of the first phase.
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    同族专利:
    公开号 | 公开日
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US6009111A|1997-04-17|1999-12-28|University Technology Corporation|System and a method for frequency-stabilizing a diode laser|
    FR3077884B1|2018-02-12|2021-01-01|Commissariat Energie Atomique|ELLIPTICAL POLARIZATION VECTOR MAGNETOMETER|
    FR3083876B1|2018-07-16|2020-10-16|Commissariat Energie Atomique|ALIGNMENT VECTOR MAGNETOMETER WITH TWO DIFFERENTLY POLARIZED PROBE BEAMS|
    FR3093360B1|2019-02-28|2021-03-19|Commissariat Energie Atomique|Isotropic and all-optical scalar magnetometer|
    FR3093816B1|2019-03-12|2021-04-16|Commissariat Energie Atomique|Zero-field slave magnetometer with low-frequency filtering of the compensation field|
    DE102021101565A1|2020-01-30|2021-08-05|Elmos Semiconductor Se|NV center based, microwave-free and galvanically isolated magnetometer with a circuit board made of glass|
    法律状态:
    2018-09-28| PLFP| Fee payment|Year of fee payment: 2 |
    2019-03-08| PLSC| Search report ready|Effective date: 20190308 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 3 |
    2020-09-30| PLFP| Fee payment|Year of fee payment: 4 |
    2021-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1758217|2017-09-06|
    FR1758217A|FR3070817B1|2017-09-06|2017-09-06|OPTICAL DENSITY SYSTEM WITH STABILIZED DAVLL SERVICING|FR1758217A| FR3070817B1|2017-09-06|2017-09-06|OPTICAL DENSITY SYSTEM WITH STABILIZED DAVLL SERVICING|
    US16/121,143| US10348054B2|2017-09-06|2018-09-04|Optical measurement system with stabilised DAVLL control|
    EP18192357.4A| EP3454139B1|2017-09-06|2018-09-04|Optical measurement system with stabilised davll servo and associated method|
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